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Abstract

We present a novel technique to generate orthogonally polarized optical single sideband modulated signals. The modulation scheme is based on all optical stimulated Brillouin scattering processing of the optical carrier of an optical single sideband modulated signal, by means of the polarization state dragging induced by this non-linear effect. This modulation technique can be used in several microwave photonics applications, such as antenna beamforming or microwave photonics filters. In order to perform a proof-of-concept experiment, the orthogonal modulator is deployed for the implementation of an RF phase-shifter.

Graphical representation of the fundamentals of the optical processing for the RF phase-shifter showing the addition of both desired and interfering terms in Eq. (3). EOC: electric field of the optical carrier; ESB: electric field of the sideband; ESBϕ: projection of the electric field of the sideband into the tunable refraction index axis; ESB0: projection of the electric field of the sideband into the constant refraction index axis.

Measured spectra of the (a) OSSB for a 5 GHz RF modulation frequency and (b) OSSB-SC signals at their respective input ports of the fiber. The center of each graph corresponds to the optical carrier wavelength.